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Development and Application of a Model for Assessing the Sustainability of Energy supply System

Fotouhi Ardakani, Saeedreza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45580 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Saboohi, Yadollah
  7. Abstract:
  8. Depletion of fossil energy reserves and rapid growth of energy demand have been challenging issues in the energy sector. Proper solution of these issues requires development of an integrated and comprehensive approaches. Such conceptual framework could provide an appropriate means for studying energy problems and anlysing the development of efficient technologies which could improve the economic viability and reduce the impact of energy system on the environmental. Therefore, analytical tools need to be developed further and they could be applied for systematic analysis of impact of new energy technologies on the economical efficiency and environmental compatibility of energy systems.
    Review of existing energy system models indicate that energy models are founded on reference energy systems and the governing equations are usually based on first law of thermodynamics while the 2nd law of thermodynamics is considered as exogenous. Hence, further development of energy system models and explicit reflection of 2nd law of thermodynamics in the set of governing equations has been the subject of present research work. Therefore, the concept of exergy and exergy costs have been applied for further development of an energy system model.
    An energy system model (ESM) has been further developed to include the set of equations based on the flow of exergy and exergy costs together with the basic equations that are normal practices in energy system models. The model has then been applied to study the development of natural gas network in Iran. It has been found that substitution of pressure reduction valves with turbo expander and utilization of energy recovery systems in the compressor stations are preferred. Utilization of energy recovery systems enhances the efficiency of natural gas network.
    It is also found that investment on new technologies is not identified as economical when scenarios based on the prices of natural gas in the domestic market. When exergy costs are minimized it is realized that the utilization of new and efficient technologies is presented as part of the optimal solution.
  9. Keywords:
  10. Energy Modeling ; Exergy Optimization ; Life Cycle Assessment

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